ASTM-D5464 2001
$44.96
D5464-93(2001) Standard Test Methods for pH Measurement of Water of Low Conductivity
| Published By | Publication Date | Number of Pages |
| ASTM | 2001 | 14 |
ASTM D5464-93-Reapproved2001
Historical Standard: Standard Test Methods for pH Measurement of Water of Low Conductivity
ASTM D5464
Scope
1.1 These test methods are applicable to determine the pH of water samples with a conductivity lower than 100 µ S/cm (see Annex A1 and Table A1.1 and Table A1.2 ) over the pH range of 3 to 11 (see Fig. 1). pH measurements of water of low conductivity are problematical (see Annex A2). Specifically, these test methods avoid contamination of the sample with atmospheric gases (see Section 7) and prevent volatile components of the sample from escaping. These test methods provide for pH electrodes and apparatus that address the considerations discussed in Annex A2. These test methods also minimize problems associated with the sample’s pH temperature coefficient when the operator uses these test methods to calibrate an on-line pH monitor or controller (see Appendix X1). Two test methods are given as follows:
1.2 Test Method A covers the precise measurement of pH in water of low conductivity utilizing a real-time, short duration, flowing sample procedure.
1.3 Test Method B covers the measurement of pH in water of low conductivity with a lower limit of 2.0 S/cm, utilizing a static grab-sample procedure where it is not practicable to take a real-time flowing sample.
Note 1–Test Method A is preferred over Test Method B whenever possible. Test Method A is not subject to the limited conductivity range, temperature interferences, potential KCl contamination, and time limitations found with Test Method B.
1.4 The values stated in SI units are to be regarded as standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Keywords
automatic temperature compensator; controlled leakage rate; flowing liquid junction; high purity water; liquid junction potential; low conductivity water; pH glass electrode; pH temperature coefficient; reference electrode; solution temperature coefficient
ICS Code
ICS Number Code 13.060.50 (Examination of water for chemical substances)
DOI: 10.1520/D5464-93R01
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | Scope Referenced Documents FIG. 1 |
| 2 | Terminology Reagents Summary of Test Method FIG. 2 |
| 3 | Significance and Use FIG. 3 FIG. 4 |
| 4 | Interferences Apparatus FIG. 5 FIG. 6 |
| 5 | Sampling and Sample Handling Calibration Procedure |
| 6 | Precision and Bias Summary of Test Method Significance and Use |
| 7 | Interferences Apparatus Sampling and Sample Handling Calibration Procedure Precision and Bias Keywords A1. DISCUSSION OF THE CONDUCTIVITY RANGE FOR THESE TEST METHODS A1.1 |
| 8 | A2. CONSIDERATIONS FOR THE REQUIREMENT OF SPECIALIZED pH MEASUREMENT APPARATUS A2.1 A2.2 TABLE A1.1 TABLE A1.2 |
| 9 | A3. COMPARISON OF TEST METHODS A AND B A3.1 A3.2 A3.3 X1. TEMPERATURE EFFECTS IN ULTRA-PURE WATER X1.1 X1.2 X1.3 X1.4 X1.5 X1.6 |
| 10 | X1.7 TABLE X1.1 |
| 11 | X2. SUPPLEMENT TO TEST METHOD A—THE FLOWING SAMPLE CALIBRATION (FSC) PROCEDURE TO CALIBRATE ON-LINE pH SENSORS X2.1 X2.2 X2.3 TABLE X1.2 |
| 12 | X2.4 X2.5 X3. SUPPLEMENT TO TEST METHOD B—THE GRAB SAMPLE CALIBRATION (GSC) PROCEDURE TO CALIBRATE ON-LINE pH SENSORS X3.1 X3.2 X3.3 X3.4 X3.5 X3.6 X4. EFFECTS OF CO2 ON pH MEASUREMENTS OF HIGH PURITY WATER X4.1 |
| 13 | FIG. X4.1 |
| 14 | REFERENCES TABLE X4.1 |
